Carbon-sulphur composite electrode based on carbon nano tube arrays as well as preparation method and application of carbon-sulphur composite electrode

The invention discloses a carbon-sulphur composite electrode based on carbon nano tube arrays and a preparation method of the carbon-sulphur composite electrode. The carbon-sulphur composite electrode is formed by compounding the carbon nano tube arrays and a conductive substrate with a sulphur-containing active substance. The preparation method of the carbon-sulphur composite electrode comprises the steps that directionally arranged carbon nano tube arrays are vertically grown on the surface of the conductive substrate and the sulphur-containing active substance is infiltrated into the structure of the carbon nano tube arrays by virtue of heat treatment. The preparation method of the carbon-sulphur composite electrode is simple in operation and low in cost, a conductive agent and a binding agent are not additionally added in the prepared carbon-sulphur composite electrode, the active substance of the carbon-sulphur composite electrode is contacted with an electric conductor in nano scale, contact resistance is low, rate is high, and energy density is high. The invention also discloses a secondary aluminium battery taking the carbon-sulphur composite electrode as a positive electrode.